What is a Book?

Is it a time machine, Transporting me to an era Time forgot? The middle of a war, A medieval ball, A harrowing battle, The fall of a nation? Or is it a Portal to another dimension, Another world Where dragons soar And make the sky alight with fire, Where princesses Are always saved by The charming prince? Or can they transport me To a mountain top in Asia, Or the Eiffel Tower, Or the pyramids, Or the Great Wall? Books are many things, But they will always be Magic.